C6H4Cl2O

C6H4Cl2O is the molecular formula for a group of compounds known as dichlorophenols. These are phenolic substances in which a single hydroxyl group is attached to a benzene ring that bears two chlorine substituents. The same formula accommodates several isomers, differing in the positions of the chlorine atoms. Common examples include 2,3-dichlorophenol, 2,4-dichlorophenol, 2,5-dichlorophenol, 2,6-dichlorophenol, 3,4-dichlorophenol, and 3,5-dichlorophenol.

Industrial production typically involves the chlorination of phenol under controlled conditions, which yields mixtures of dichlorophenol isomers that can be separated and purified as needed. These compounds also appear as intermediates in the synthesis of dyes, pigments, agrochemicals, and other specialty chemicals. Some dichlorophenols have historically been used in wood preservation, disinfectants, and as building blocks for more complex organic molecules.

Physical and chemical properties of dichlorophenols vary with substitution pattern but share common features: they are generally colorless to pale solids or liquids with a characteristic phenolic odor, and they exhibit limited water solubility while dissolving in organic solvents. The hydroxyl group imparts typical phenolic reactivity, including acidity sufficient to form salts with bases.

Safety and environmental considerations are important. Dichlorophenols can be toxic to aquatic life and may irritate skin or eyes on exposure. They are typically handled under strict chemical safety guidelines to minimize exposure and environmental release.